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1.
Rev. bras. farmacogn ; 13(supl.2): 8-11, 2003. ilus, graf
Article in Portuguese | LILACS | ID: lil-526477

ABSTRACT

This work describes the evaluation of the antioxidant activity in the system b-carotene / linoleic acid and radical scavenging effects of the substances 2',4'-dihydroxychalcone, 2',3,4,4'-tetrahydroxychalcone (butein), 4-methoxy-2',3,4'-trihydroxychalcone, 7-hydroxyflavanone, 3',4',7-trihydroxyflavanone (butin), 7,4'-dihydroxyflavanone (liquiritigenin), 6-methoxy-7- hydroxydihydroflavonol and lasiodiplodin isolated of the extract CHCl3 of the stem of Dioclea violacea and 3',4',5,7-tetrahydroxyflavanol (quercetin), 4',7- dimethoxy-3',5-dihydroxyflavanol and epicatechin isolated of the Erythroxylum nummularia leaves. These compounds were evaluated and compared with the antioxidant standards n-propyl gallate, BHT and á α-tocoferol.

2.
Phytochemistry ; 55(7): 805-8, 2000 Dec.
Article in English | MEDLINE | ID: mdl-11190400

ABSTRACT

The A-type proanthocyanidin, epigallocatechin-(2beta-->7,4beta-->8)-epicatechin, together with the known epicatechin, luteolin 3'beta-D-glucopyranoside, chrysoeriol 7beta-D-glucopyranoside and 2-methylpentan-2,4-diol, were isolated from leaves of Dioclea lasiophilla. The structures were established on the basis of their spectral data. Antioxidant activities of isolates were measured using the autooxidation of beta-carotene in a linolenic acid suspension method.


Subject(s)
Anthocyanins/isolation & purification , Antioxidants/isolation & purification , Fabaceae/chemistry , Plants, Medicinal , Proanthocyanidins , Anthocyanins/chemistry , Antioxidants/chemistry , Molecular Structure , Spectrum Analysis
3.
Revista da Associacao Paulista de Cirurgioes Dentistas;65(4): 298-303,
in Portuguese | URUGUAIODONTO | ID: odn-23091

Subject(s)
Mandible , Medical Records
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